A DECam Search for Explosive Optical Transients Associated with IceCube Neutrinos - INSPIRE

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A DECam Search for Explosive Optical Transients Associated with IceCube Neutrinos

DES

Collaboration

•

R. Morgan
(
- Wisconsin U., Madison
)

Jul 16, 2019

25 pages

Published in:

Astrophys.J. 883 (2019) 125

Published: Sep 26, 2019

e-Print:

1907.07193 [astro-ph.HE]

DOI:

10.3847/1538-4357/ab3a45 (publication)

Report number:

DES-2018-0408,
FERMILAB-PUB-19-342-AE

Experiments:

DES

View in:

reference search14 citations

Citations per year

Abstract: (arXiv)

In this work, we investigate the likelihood of association between realtime, TeV-PeV energy neutrino alerts from IceCube and optical counterparts in the form of core-collapse supernovae (CC SNe). The optical follow-up of IceCube alerts requires two main instrumental capabilities: (1) deep imaging, since 73% of neutrinos would come from CC SNe at redshifts

z > 0.3

, and (2) a large field of view (FoV), since typical IceCube muon neutrino pointing accuracy is on the order of

\sim1

~deg. With Blanco/DECam (

gri

to 24th magnitude and

2.2

~deg diameter FoV), we performed a triggered optical follow-up observation of two IceCube alerts, IC170922A and IC171106A on

\sim6

~nights during the

\sim3

~weeks following each alert. For the IC170922A (IC171106A) follow-up observations, we expect that 12.1% (9.5%) of coincident CC SNe at

z \lesssim 0.3

are detectable, and that on average, 0.23 (0.07) unassociated SNe in the neutrino 90% containment regions also pass our selection criteria. We find two candidate CC SNe that are temporally coincident with the neutrino alerts in the FoV, but none in the 90% containment regions, which is statistically consistent with expected rates of background CC SNe for these observations. If CC SNe are the dominant source of TeV-PeV neutrinos, we would expect an excess of coincident CC SNe to be detectable at the

3\sigma

confidence level using DECam observations similar to those of this work for

\sim60

(

\sim200

) neutrino alerts with (without) redshift information for all candidates.

Note:

Published in ApJ

neutrino: particle source
neutrino: flux
supernova: collapse
neutrino: energy: high
IceCube
background
redshift
messenger
optical
efficiency

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